It's not possible without essentially destroying the entire city and rebuilding it with more dense buildings. Public transit would be intolerably bad, because t

It's not possible without essentially destroying the entire city and rebuilding it with more dense buildings. Public transit would be intolerably bad, because the parking lots are too big. The buildings are too far apart, and too far from the roads. You would have to have stops so frequent that it would take too long to get anywhere that was far away, and you would still be dropped off a significant walk from any building.